Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf896174d80bc33…

MALICIOUS

PDF

61.7 KB Created: 2021-01-14 13:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8d168f75ff8e610394d4d029613011b9 SHA-1: 970e7c519817a91b82c30aac8c1766d6a7aa0fbf SHA-256: 6bf896174d80bc337794500089cb7547dee305f3e46daa7aa96c7ac01a7da08f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The presence of numerous links suggests an attempt to manipulate search engine results or direct users to phishing sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/aws?utm_term=capitalization+punctuation+worksheets+pdf In PDF document text
    • https://gazasajud.weebly.com/uploads/1/3/4/8/134879445/zotosomemewav-dikaxodudekul-kupumadebupub-vawaf.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/vofedezom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465539/normal_5fc6d93b96cba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5f8b226f6e85b.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/eQhd15a/73613570013.pdfIn PDF document text
    • https://site-1247091.mozfiles.com/files/1247091/zotebigubanudejiwuf.pdfIn PDF document text
    • https://site-1180410.mozfiles.com/files/1180410/train_simulator_2016_activation_key_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5fc43608444ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369900/normal_5ffb7873d3969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5f98c47334d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_5fa0b4e31314a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5faba6699eb5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f99008ed3f04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64E 5352 bytes
SHA-256: c1f4c71d5d34b5dd10a34a56bf6be8fcc8c303fd7b7c2378d78fe534eaaef9b9
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 9792 bytes
SHA-256: eaa5501f4cc25d78fd207ffae86fc96bcbdedd7cd84a45d9b6922542fb11d848

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